package com.bsh.utils;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {
	/**
	 * 获取访问用户的客户端IP（适用于公网与局域网）.
	 */
	public static final String getIpAddr(final HttpServletRequest request) {
		if (request == null) {
//			throw (new Exception("getIpAddr method HttpServletRequest Object is null"));
			return null;
		}
		String ipString = request.getHeader("x-forwarded-for");
		if (org.apache.commons.lang3.StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
			ipString = request.getHeader("Proxy-Client-IP");
		}
		if (org.apache.commons.lang3.StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
			ipString = request.getHeader("WL-Proxy-Client-IP");
		}
		if (org.apache.commons.lang3.StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {
			ipString = request.getRemoteAddr();
		}

		// 多个路由时，取第一个非unknown的ip
		final String[] arr = ipString.split(",");
		for (final String str : arr) {
			if (!"unknown".equalsIgnoreCase(str)) {
				ipString = str;
				break;
			}
		}
		return ipString;
	}

	  
	  
	  /** 
	   * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
	   * 
	   * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
	   * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
	   * 
	   * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
	   * 192.168.1.100 
	   * 
	   * 用户真实IP为： 192.168.1.110 
	   * 
	   * @param request 
	   * @return 
	   */
	  public static String getIpAddr2(HttpServletRequest request) { 
	    String ip = request.getHeader("x-forwarded-for"); 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("Proxy-Client-IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("WL-Proxy-Client-IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("HTTP_CLIENT_IP"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getHeader("HTTP_X_FORWARDED_FOR"); 
	    } 
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
	      ip = request.getRemoteAddr(); 
	    } 
	    return ip; 
	  } 
	  

	
}
